public static void SubmitNewsVark(NewsVark item)
        {
            using (var ctx = new RentooloEntities())
            {
                if (item.Id == 0)
                {
                    ctx.NewsVark.Add(item);
                }
                else
                {
                    var obj = ctx.NewsVark.Single(x => x.Id == item.Id);
                    obj.Date       = item.Date;
                    obj.Text       = item.Text;
                    obj.CreateDate = item.CreateDate;
                    obj.AuthorId   = item.AuthorId;
                    obj.Active     = item.Active;
                }

                try
                {
                    ctx.SaveChanges();
                }
                catch (System.Exception ex)
                {
                    DataHelper.AddException(ex);
                }
            }
        }
        public static void DeleteNewsVark(int id)
        {
            using (var ctx = new RentooloEntities())
            {
                NewsVark obj = ctx.NewsVark.Single(x => x.Id == id);

                ctx.NewsVark.Remove(obj);

                try
                {
                    ctx.SaveChanges();
                }
                catch (System.Exception ex)
                {
                    DataHelper.AddException(ex);
                }
            }
        }